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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.16 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.ereg">
<refnamediv>
<refname>ereg</refname>
<refpurpose>Regular expression match</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>ereg</methodname>
<methodparam><type>string</type><parameter>pattern</parameter></methodparam>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
<methodparam choice="opt"><type>array</type><parameter role="reference">regs</parameter></methodparam>
</methodsynopsis>
<simpara>
Searches a <parameter>string</parameter> for matches to the regular
expression given in <parameter>pattern</parameter> in a case-sensitive
way.
</simpara>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>pattern</parameter></term>
<listitem>
<para>
Case sensitive regular expression.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>string</parameter></term>
<listitem>
<para>
The input string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>regs</parameter></term>
<listitem>
<para>
If matches are found for parenthesized substrings of
<parameter>pattern</parameter> and the function is called with the
third argument <parameter>regs</parameter>, the matches will be stored
in the elements of the array <parameter>regs</parameter>.
</para>
<para>
$regs[1] will contain the substring which starts at the first left
parenthesis; $regs[2] will contain the substring starting at the
second, and so on. $regs[0] will contain a copy of the complete string
matched.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the length of the matched string if a match for
<parameter>pattern</parameter> was found in <parameter>string</parameter>,
or &false; if no matches were found or an error occurred.
</para>
<para>
If the optional parameter <parameter>regs</parameter> was not passed or
the length of the matched string is 0, this function returns 1.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>ereg</function> example</title>
<para>
The following code snippet takes a date in ISO format (YYYY-MM-DD) and
prints it in DD.MM.YYYY format:
</para>
<programlisting role="php">
<![CDATA[
<?php
if (ereg ("([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})", $date, $regs)) {
echo "$regs[3].$regs[2].$regs[1]";
} else {
echo "Invalid date format: $date";
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
<function>preg_match</function>, which uses a Perl-compatible
regular expression syntax, is often a faster alternative to
<function>ereg</function>.
</para>
</note>
<note>
<simpara>
Up to (and including) PHP 4.1.0 <varname>$regs</varname> will be
filled with exactly ten elements, even though more or fewer than
ten parenthesized substrings may actually have matched. This has
no effect on <function>ereg</function>'s ability to match more
substrings. If no matches are found, <literal>$regs</literal>
will not be altered by <function>ereg</function>.
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>eregi</function></member>
<member><function>ereg_replace</function></member>
<member><function>eregi_replace</function></member>
<member><function>preg_match</function></member>
<member><function>strpos</function></member>
<member><function>strstr</function></member>
<member><function>quotemeta</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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